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			<h1>Transaction</h1>
			<p>Transaction is supported by the Connection from Jdbc. Here is a simple sample:</p>
<!-- HTML generated using hilite.me --><div style="background: #f8f8f8; overflow:auto;width:auto;border:solid gray;border-width:.1em .1em .1em .8em;padding:.2em .6em;"><pre style="margin: 0; line-height: 125%"><span style="color: #008000; font-weight: bold">final</span> SQLTransaction tran <span style="color: #666666">=</span> sqlExecutor<span style="color: #666666">.</span><span style="color: #7D9029">beginTransaction</span><span style="color: #666666">(</span>IsolationLevel<span style="color: #666666">.</span><span style="color: #7D9029">READ_COMMITTED</span><span style="color: #666666">);</span>
<span style="color: #408080; font-style: italic">// DO NOT CLOSE the connection manually. It will be automatically closed after the transaction is committed or rolled back.</span>
<span style="color: #008000; font-weight: bold">final</span> Connection conn <span style="color: #666666">=</span> tran<span style="color: #666666">.</span><span style="color: #7D9029">connection</span><span style="color: #666666">();</span>
<span style="color: #B00040">boolean</span> noException <span style="color: #666666">=</span> <span style="color: #008000; font-weight: bold">false</span><span style="color: #666666">;</span>

<span style="color: #008000; font-weight: bold">try</span> <span style="color: #666666">{</span>
    <span style="color: #408080; font-style: italic">// Do something with the &quot;conn&quot;. For example:</span>
    <span style="color: #408080; font-style: italic">//</span>
    <span style="color: #408080; font-style: italic">// long id = sqlExecutor.insert(conn, INSERT_ACCOUNT, account);</span>
    <span style="color: #408080; font-style: italic">// DataSet result = sqlExecutor.query(conn, SELECT_ACCOUNT_BY_ID, id);</span>

    noException <span style="color: #666666">=</span> <span style="color: #008000; font-weight: bold">true</span><span style="color: #666666">;</span>
<span style="color: #666666">}</span> <span style="color: #008000; font-weight: bold">finally</span> <span style="color: #666666">{</span>
    <span style="color: #008000; font-weight: bold">if</span> <span style="color: #666666">(</span>noException<span style="color: #666666">)</span> <span style="color: #666666">{</span>
        tran<span style="color: #666666">.</span><span style="color: #7D9029">commit</span><span style="color: #666666">();</span>
    <span style="color: #666666">}</span> <span style="color: #008000; font-weight: bold">else</span> <span style="color: #666666">{</span>
        tran<span style="color: #666666">.</span><span style="color: #7D9029">rollback</span><span style="color: #666666">();</span>
    <span style="color: #666666">}</span>
<span style="color: #666666">}</span>
</pre></div>


		<p></p>
		<p>We should avoid to open too many unnecessary transactions in heavy/big online systems.</p>

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